/* DE1: $Id: gl_tga.h 1713 2004-05-31 15:04:44Z skyjake $
 * Copyright (C) 2003, 2004 Jaakko Keränen <jaakko.keranen@iki.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not: http://www.opensource.org/
 */

/*
 * gl_tga.h: TGA Images
 */

#ifndef __MY_TARGA_H_
#define __MY_TARGA_H_

#include "sys_file.h"

#ifdef __cplusplus
extern          "C" {
#endif

	typedef unsigned char uChar;   // 1 byte
	typedef unsigned short int uShort;	// 2 bytes

	// Screen origins.
#define	TGA_SCREEN_ORIGIN_LOWER	0  // Lower left-hand corner.
#define	TGA_SCREEN_ORIGIN_UPPER	1  // Upper left-hand corner.

	// Data interleaving.
#define	TGA_INTERLEAVE_NONE		0  // Non-interleaved.
#define	TGA_INTERLEAVE_TWOWAY	1  // Two-way (even/odd) interleaving.
#define	TGA_INTERLEAVE_FOURWAY	2  // Four-way interleaving.

	enum {
		TGA_FALSE,
		TGA_TRUE,
		TGA_TARGA24,			   // rgb888
		TGA_TARGA32				   // rgba8888
	};

#pragma pack(1)					   // Confirm that the structures are formed correctly.
	typedef struct				   // Targa image descriptor byte; a bit field
	{
		uChar           attributeBits:4;	// Attribute bits associated with each pixel.
		uChar           reserved:1;	// A reserved bit; must be 0.
		uChar           screenOrigin:1;	// Location of screen origin; must be 0.
		uChar           dataInterleave:2;	// TGA_INTERLEAVE_*
	} TARGA_IMAGE_DESCRIPTOR;

	typedef struct {
		uChar           idFieldSize;	// Identification field size in bytes.
		uChar           colorMapType;	// Type of the color map.
		uChar           imageType; // Image type code.
		// Color map specification.
		uShort          colorMapOrigin;	// Index of first color map entry.
		uShort          colorMapLength;	// Number of color map entries.
		uChar           colorMapEntrySize;	// Number of bits in a color map entry (16/24/32).
		// Image specification.
		uShort          xOrigin;   // X coordinate of lower left corner.
		uShort          yOrigin;   // Y coordinate of lower left corner.
		uShort          imageWidth;	// Width of the image in pixels.
		uShort          imageHeight;	// Height of the image in pixels.
		uChar           imagePixelSize;	// Number of bits in a pixel (16/24/32).
		TARGA_IMAGE_DESCRIPTOR imageDescriptor;	// A bit field.
	} TARGA_HEADER;
#pragma pack()					   // Back to the default value.

	// Save the rgb565 buffer as Targa 16.
	int             TGA_Save24_rgb565(char *filename, int w, int h,
									  uShort * buffer);

	// Save the rgb888 buffer as Targa 24.
	int             TGA_Save24_rgb888(char *filename, int w, int h,
									  uChar * buffer);

	int             TGA_Save24_rgba8888(char *filename, int w, int h,
										uChar * buffer);

	// Save the rgb888 buffer as Targa 16.
	int             TGA_Save16_rgb888(char *filename, int w, int h,
									  uChar * buffer);

	// Load an rgba8888 image (32 bits per pixel).
	int             TGA_Load32_rgba8888(DFILE * file, int w, int h,
										uChar * buffer);

	// Get the dimensions of a Targa image.
	int             TGA_GetSize(char *filename, int *w, int *h);

#ifdef __cplusplus
}
#endif
#endif